A student wrote three statements about cell signalling.
1- A signal chemical always has the same shape as a protein receptor on a target cell.
2- An increase in temperature may decrease the effect of cell to cell signalling.
3- A mutation may decrease production of active protein receptors for the cell surface membrane.
Which statements are correct?
1 )
1, 2 and 3
2 )
1 and 3 only
3 )
1 only
2 and 3 only
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